A satellite transmitter includes K transmission antenna elements, a multiplexing unit configured to multiplex each of K digital signals on a frequency axis and then convert the multiplexed digital signals to time-domain digital signals, a digital-to-analog converter, a PAPR calculation unit configured to calculate a PAPR for each of the K digital signals, a beam-to-beam relative phase calculation unit configured to calculate a beam-to-beam relative phase for suppressing a peak power of the transmission antenna elements, an excitation coefficient calculation unit configured to calculate K updated excitation coefficients based on the beam-to-beam relative phase and the beam-formation excitation coefficient, and an excitation coefficient multiplication unit configured to generate the digital signals of a frequency domain to be output to the multiplexing unit by multiplying a received relay signal by each of the K updated excitation coefficients in the frequency domain.

This disclosure provides systems, methods and apparatus for communicating a satellite behavior change. In one aspect, a satellite identifies a satellite behavior change to occur for the satellite of a non-terrestrial network for cellular communications. The apparatus also signals the satellite behavior change to a user equipment serviced by the satellite. In another aspect, a user equipment obtains, from a satellite servicing the user equipment, a signaling of a satellite behavior change to occur for the satellite. The user equipment also adjusts one or more user equipment parameters for cellular communication based on the obtained signaling. The satellite behavior change may include a satellite attitude or a transmit power or coverage area of one or more satellite beams. The user equipment parameters may include satellite or beam selection or reselection to listen to paging information, satellite or beam handover parameters, or transmit power control parameters.

An information processing method provided in the present disclosure includes: allocating, to a Non-Terrestrial Network (NTN) cell, at least one of a frequency band dedicated to the NTN cell, a frequency dedicated to the NTN cell, and a Physical Cell Identifier (PCI) dedicated to the NTN cell; notifying User Equipment (UE) of at least one of the following information: a frequency band indicator of the frequency band, the frequency, and the PCI.

A non-terrestrial network (NTN) node transmits configuration information including an indication of a maximum transmission block size (TBS) for a physical uplink shared channel (PUSCH) transmission or a physical downlink shared channel (PDSCH). A TBS for the PUSCH or PDSCH is determined based on at least the indicated TBS, and one of a signal indicates one of a maximum modulation and coding scheme (MCS) for the PUSCH or PDSCH transmission or whether the PUSCH or PDSCH transmission uses a default MCS, or the MCS is determined based on at least the indicated maximum MCS, and the PUSCH is transmitted or the PDSCH is received based on the determined TBS and the determined MCS. A maximum TBS, a maximum MCS, or a number of hybrid automatic repeat request (HARD) processes is indicated by a master information block (MIB), a system information block (SIB), or radio resource control (RRC) signaling.

A space-based communications network (100) includes at least one central ground station (116) having a transceiver that is configured to communicate with satellites, such as cube satellites (110). The cube satellites (110) form an ad hoc network of orbital cube satellites, in which each of the cube satellites (110) communicate with each other. One of the cube satellites communicates with the ground station (116). A ground-based control system (1000) communicates with the central ground station (116). The control system (1000) continuously determines a configuration of the ad hoc network (100) and communicates network control information for the cube satellites (110) to maintain communications in the ad hoc network (100). The cube satellites (110) disseminate the network control to each other via the ad hoc network (100).

A method for determining an optimized transmission window having a first start time and a first end time, for transmitting data from a device to a relay station travelling with respect to one another. The optimized transmission window is determined by the device listening during at least part of the travelling. The device determines the optimized transmission window by starting a receiving mode for receiving a signal from the relay station, setting the first start time when receiving the signal, stopping the receiving mode when reception of the signal stops, and setting the first end time.

Technology for a mobile repeater operable to operate in a low power mode is disclosed. The repeater can comprise of detecting an uplink signal from one or more mobile devices for a selected period of time. The repeater can comprise of setting the mobile repeater to the low power mode when the uplink signal is not detected within the selected period of time to reduce a power draw. Wherein setting the mobile repeater to the low power mode comprises turning off one or more signal chain components in one or more signal chains including at least one power amplifier (PA) to reduce a power draw of the mobile repeater. Wherein the one or more signal chain components further comprises a low noise amplifier (LNA); a gain block; or a variable attenuator.

A multiple-access transceiver handles communications with mobile stations in environments that exceed mobile station design assumptions without necessarily requiring modifications to the mobile stations. One such environment is in Earth orbit. The multiple-access transceiver is adapted to close communications with mobile stations while exceeding mobile station design assumptions, such as greater distance, greater relative motion and/or other conditions commonly found where functionality of a terrestrial transceiver is to be performed by an orbital transceiver. The orbital transceiver might include a data parser that parses a frame data structure, a signal timing module that adjusts timing based on orbit to terrestrial propagation delays, frequency shifters and a programmable radio capable of communicating from the Earth orbit that uses a multiple-access protocol such that the communication is compatible with, or appears to the terrestrial mobile station to be, communication between a terrestrial cellular base station and the terrestrial mobile station.

Systems and methods for supporting more flexible coverage areas and spatial capacity assignments using satellite communications systems are disclosed. A hub-spoke, bent-pipe satellite communications system includes: terminals; gateways; a controller for specifying data for controlling satellite operations in accordance with a frame definition including timeslots for a frame and defining an allocation of capacity between forward and return traffic; and a satellite including: pathways; at least one LNA, an output of which is for coupling to a pathway and to amplify uplink beam signals in accordance with the allocation; and at least one HPA, an input of which is for coupling to the pathway and to amplify downlink beam signals in accordance with the allocation, and wherein the frame definition specifies at least one pathway as a forward pathway for at least one timeslot and as a return pathway for at least one other timeslot in the frame.

Systems, methods, apparatuses, and computer program products for interference coordination between non-terrestrial network and terrestrial network stations are provided. One method may include exchanging, by a non-terrestrial network node, round trip time (RTT) information with at least one terrestrial network node. The method may also include informing the at least one terrestrial network node of resources scheduled at the non-terrestrial network node for one or more user equipment (UEs) to coordinate interference mitigation with the at least one terrestrial network node.